Sawmill dog



Aug. 2, 1927, 1,637,907

R. E. 'LANGILL ET AL.

SAWMILL DOG Filed Jam. 25', 1926 2 Sheets-Sheet 1 ml W IN VEN TORS."F055 5 44 9mm. A? Mu. mm 5. euerem A TTORNEYS.

R. E. LANGILL ET AL SAWMILL DOG Aug. 2 1927.

2 Sheets-Sheet 2 Filed Jan. 25, 1926 INVENTORS.

E055 A. A Ana/L 1. J Mu. mm 3 6205753 I ATTORNEYJ.

Patented Aug. 2, 1927.

noes E. LANGILL AND WILLIAM B. GRUE'IER, or ivmnoivimnngivrron cn v,ASSIGNORS TO THE PRESCOTT COMPANY, OF MEIIOMINEE, MICHIGAN, CORPORATION01F I MICHIGAN.

This invention relates to improvements insawmill dogs of the so-calledtong type.

Sawmill dogs of the character referred to comprise, in general, a knee,a pair of tong 5 arms arranged in a vertical plane transverse to theface of the knee and provided with teeth extending beyond the latter,and suit-- 'ablemea-ns or mechpnism for etfecting'movement of the tongarms toward "and away in from each other to grip and release the log.The tong teeth engage the upper and under sides or edges of the log orcant to securely hold the same against the face of the knee 'in thewell-known manner. In the tong dog's constructed heretofore, thedistance which the tong teeth extend outwardly beyond the face of theknee is fixed and can- .not be adjusted, so that the thickness oi. the"last board is determined by this distance which is 'necessarily'anappreciable amount for the reason that the teeth must extend outwardlybeyond 'theface of the knee an appreciable amount in order to get a goodgrip on the log. In the so-called boss dogs, provision has been ma'deforadjusting'the teeth in a direction transverse to the "face of the knee,the teeth being moved outward.- ly to their fullest extent for holdinglogs and moved or adjusted to their extreme O inward position withrespectto the face of the knee for holding a cant or small board. In theboss dogs, however, the teeth bite into and mar the face board, which isa serious objection, particularly in the handling and sawing of valuabletimber. in our copending application Serial No. 56,590, filed September16, 1925, a sawmill dog of "the tong type has been shown and describedwherein the tong arms are adjustable longi tudinally in a directiontransverse to the face of the knee whereby the tong teeth maybe movedoutwardly a comparatively great distance beyond the face of the kneeforholding a log, and adjusted or moved inwardly to within acomparatively small distance from the face of the knee for holding, thelast board. WVhile this proposed construction has proven to'be verysatisfactory and represents a distinct step forward in the art, it hasbeen found that theupper tong tooth, which is designed particularly tohold large logs, is not so well adapted or shaped to hold boards. Inthis improved sawmill dog, furthermore, the tong toot-h does not moveabsolutely parallel with the knee.

' SAWMILL nos.

. i 7 Application filed January 25, 1926. Serial No.83-,438.

faceof the knee, and while this-is dbjectionable in the holding of logscreams, it

does make some dilference i-n the 'ho'ldingef con'iparat'lvelythin-boards. I r

' @ne of the 'zobjects of the "present invention, therefore, istoprovidean -improved' means for holding or g-rriding one of the tong armsof sawmill dogs ofthe character inferred to whereby the tooth fixed inthe outer end of this arm may be adjusted in a direction transversetothe face o f the Another object is to provide, i-na sawmill dog of thetong type,-an auX-i l-iary toothas'sociat-ed with and having a d ifferent s'hape than one of the tongteeth, the arrangement being suchthat in the dogging of compara-v tively small boards, the tong teeth maybe withdrawn 'or moved inwardly to permit the auxiliary tooth, which isparticularly adapted and shaped for holding these comparatively smallboards, to engage and hold the same, the auxiliary tooth being"guidedfor movement parallel to the face of the knee.

Other objects a after appear. For the purpose of illustrating :t

he invention, an embodiment thereof'is shown in the -drawings, in whichI Figure '1 is a side elevation of the sawmill nd advantages will hereindog shown and described in our above co-"1' pending application, showingthe auxiliary tooth and the improved guiding means for the upper tongarm arpp lied thereto; and

Fig. 2 is a tront elevation, looking toward 8 pivotally mounted -on abolt "9 {extending through a shoe 10. Shoe 16) comprises a base 11 andanarm "12 extending outwardly therefrom at a right angletheretmthe-outer I end of arm 12 being provided with-a down wardlyextending portion 18 provided with an opening for receiving bdlt-9' andwhich registers with a s'imilaroperiing in ba'se 111, as more clearlyshown in Fig.2. The head 14: of bolt 9 acts with the spaced members 15and '16 to guideshoe '10 for movement,

back ofmembers 15 and 16to act with head 14- of bolt 9 to guide shoe 10and hold the same; in operativerelation withrespect to the knee. Rollers24. may be loosely fitted on bolts 9, and 22 and arranged to movebetween the adjacent edges of members 15 and 16 to facilitateverticalsliding movement of shoe 1t). Asashown in Fig. 1, the auxillary tooth 21isof a different shape than the tong tooth 2 and is particularly adaptedto engage the upper edge of the comparatively small board 25 to hold thesame securely against the face 26 of the knee, the

auxiliary tooth 21 extending only a small distanceioutwardly beyond theknee face so thatthe last board maybe comparatively A lever 27 isloosely mounted on shaft 6 and connected by means of an arm 28 to aneccentric sheave 29 mounted on an eccentric i 30 fixed to a shaft 31,the latter beingroa i tatedin either direction bymeans of a reversibleelectric motor 32 connected thereto in any suitable manner. Lever-27 spro vided at the upper endthereof with an adjustable bolt 33 engagingtheadjacent rear edge of arm 5, a bolt 34- extending through an openingin, a pin 35 carried by arm 5 and threaded upon the end of bolt 34:,whereby .arm 5 is connected to lever27 for movein block 42 keyed toshaft 31.

being pivotally connected at 36 to lever 27,

{a spring 37 being arranged on boltB land compressed between pin 35 and;nuts 38 ment therewith. {The lower tong arm 39 is *i upivotallyconnected at 'itsrear end 'to a link 10 connected to a crank pin 41'fixed to a end oftong arm 39 is provided with a tooth a 43 and isloosely, fitted in a shoe 14:, a bolt 1 45" extending loosely throughthis shoe and beingprovided with a head 46 fitting "back of members 15and 16 for the purpose ported forpivotal movement on a shaft 51' ofguiding the shoe for vertical movement and holding the same 1n operativerelation with respect to knee 17 A roller 4:7, similar 1101101181824,may be loosely arranged on bolt 15 between members 15 and 16,

y A rack 18 is pivotally connected to lower tong arm 39 by means of apin 49 and er;- tends upwardly through a housing 50 supj ournaled inbearings 52with which the upper tong arm 1 1s provided at each s1dethereof, a pinion (not shown) being fixed to shaft 51 and being arrangedin mesh with the teeth of rack 48 so that the tong arms .lhe dotted lineposition.

The forward 1 and 39 may be moved toward or away 7 from each other uponrotation of shaft 51 in the desired direction by means of a re versibleelectric motor 53 connected to shaft 52 in any suitable manner. i

' The operation of the improved sawmill dog is as follows: In dogging alog, motor 32 is operated to rotate shaft 31 in a counterclockwisedirection to effect rotary movement of lever 27 in this direction aboutshaft 6, bolt engaging the rear edge of arm 5 to move upper tong arm 1forward so thatthe tong tooth 2 moves forward a a substantial distancein a direction transverse to' the face 26 of the knee to the dotted lineposition, which position is determined by the engagement of the stop"bolt'54 with block 4-2. This forward movement of the upper tong arm isaccompanied by a similar movement of lower tong arm 39, the sliding fitof the forward end of this armin shoe 4 1 permitting this movement-ofthe arm to project the tong'tooth 43 a substantial distance beyond theface of the knee to The motor 53 is then operated 1n the usual manner toeffect ncrement of the tong arms toward each other to grip or hold thelog. When'it is desired to saw a thinboard, motor 53 is reversed towithdraw the tong teeth 2 and 1&3 to the respective positions thereofshown in full lines, which positions are determined by engagement of thestop bolt 55-with block $2, the arrangement being such that tooth" 2 iscompletely withdrawn to a position to the right of the knee face 26, asshown, the

lam

lower tong tooth 43 extending outwardly beyond the face of the knee, acomparatively small amount equal substantially to the amount or distancewhich auxiliary tooth 21 extends beyond the face of the l nee,'as

shown. The lower end portioirof members 15 and 16 are parallelto face 26of the knee,

so that the auxiliary tooth moves parallel therewith. c V

d From the foregoing it will betseen that shoe 10 and hanger 8 supportedthereby provide means for supporting the upper tong arm 1 and permitlongitudinal sliding movement or-adjustment thereof in'adirectiontransverse to the face 26 of thelknee whereby tong tooth 2 may beprojected-or extemled outwardly to the dotted line; position 7 shown, orcompletely withdrawmasshown in full lines, to permit auxiliary tooth' 2lto engage the upper edge of board;25 and to cooperate with tooth 43 tohold the latter securely against the face of the knee, the

advantages of the tong tooth 2 thus being obtained in the holding oflogs andthe advantages of the auxiliary tooth 21 being obtained in theholding ofcomparatively small timber and boards. p i V The various otherparts of the sawmill dog, such as the driving connections between Lil-motor 53 and shaft 5 1 and between motor 32 and shaft 31, are shownancl'described in detail in our above copending application,

skilled in the art to understand the manner of embodying theConstruction constituting the present invention "in a sawmill dog of the'tong type, such as 1s shown 1n our said application.

A preferred embodiment of the invention has been shown and described,but of'course various changes in the size, shape and arrangement oftheparts may be adopted without departing from the spirit of the inventionor the scope of the claims.

The invention claimed is:

1. In a sawmill dog, a knee having a verticaliface', a shoe, a hanger, abolt connecting said shoe and hanger for pivotal movement with respectto each other and arranged with its head engaging said knee to guidesaid shoe and hanger for movement parallel to the knee face, alog-holding arm supported for pivotal movement in a vertical plane andarranged with its log-engaging end extending loosely through said hangerand beyondthe knee face, and means operable to effect said pivotalmovement of said arm.

2. In a sawmill dog, a knee, a shoe, means for constraining the shoe toadjustments up and down in a vertical plane, a log-holding arm having alog-holding tooth at its outer end portion, means for positivelyinterconnecting the shoe and said arm to constrain the shoe to move upand down vertically with the arm while permitting the arm to be adjustedindependently of the shoe inwardly and outwardly with respect to theknee, means cooperable with the arm for moving the same up and down in avertical plane whereby the shoe is also moved up and down in a verticalplane, and an auxiliary tooth fixed 'to the shoe so as to partake of thevertical movements thereof under the influence of the arm, saidauxiliary tooth being designed to engage a faced log or board.

8. In a sawmill dog, a knee having a face, a log-holding arm having alog-engaging tooth at its outer end, means for constraining thelog-holding arm to partake of up and down movement in a vertical planeand in and out translatory movement transverse to the knee face, meanscooperable with said log-holding arm for moving it up and down in avertical plane and an auxiliary tooth constrained to move vertically andparallel to the face of the knee under the influence of the log-holdingarm and designed to engage a faced board or log.

4c. In a sawmill dog, a knee having a vertical face, a log-holding armarranged transversely of the knee face and supported at its rear end forpivotal movement in a vertical plane and about a relatively fixed axis,a shoe, means extending laterally from said shoeand engaging said kneeto guide said shoe for movement parallel to the knee face, :a "hangerslidably receiving and :supporting "the log-engaging end 'of said armand carried :bysaid shoe for vertical move ment "therewith and'pivotally connected thereto to permittilting'of said "hanger uponvertical 'movement'of said arm about said axis simultaneously withsimilar movement 'ofsa'id'shoeparal'lel 'to the knee face, and

means operable to cause saidpivotal'move ment of said a-rn'n r 5. In'asa'wn' ill dog of'the tong ty-pe,*a

knee having a face, a shoe associated with said knee for verticalmovement with respect thereto and comprising a base and an arniextending outwardly from said base' at one end tliereofa'nd providedwith a downward ly extending portion, a member arranged between saidbase and said portion, said member and said base and said portion be ingprovided with registering openings, means extending through saidopenings for holding said shoe and member in assembled relation, an armarranged transversely of the knee face and extending loosely throughsaid member, said arm being provided with a tooth at the outer endthereof, and means for causing sliding movement of said arm with respectto said member whereby said toot-h may be adjusted with respect to theknee face.

6. In a sawmill dog, a knee, a log-holding arm having a log-engagingtooth and arranged with said tooth disposed adjacent the knee face,meanssupporting said arm for rotary movement in a fixed vertical planeand for bodily movement insaid plane in a direction transverse 'to theknee face to adjust said tooth varying distances with respect to thelater, means operable to impart said movements to said arm, and anauxiliary tooth' extending outwardly beyond the knee face and guided andsupported for movement parallel thereto and for move ment with said armin said vertical plane, said auxiliary tooth being operable to engage afaced log upon bodily movement of said arm in said plane to itsrespective position of adjustment to place said first-named toothinwardly beyond the knee face.

7. In a sawmill dog, a knee having a 'vertical face, a shoe, a hanger, abolt connecting sa1d shoe and hanger for pivotal movement with respectto' each other and arranged wlth its head engaging sa1d knee to guidesaid shoe and hanger for movement parallel to the knee face, alog-holding arm supported'for pivotal movement in a vertical plane andarranged with its log-engaging end extending loosely through saidhanger, and beyond the knee face, an auxiliary tooth car ried by saidshoe and projecting beyond the knee faceshort of the range of operationof said log-engaging end and disposed in such ise as to engage a facedlog upon move ment of said arm With respectto saidhanger to position itslog-engaging end inwardly with respect to the knee face, means forimparting said last-named movement to said arm, and means operable toeffect saidpivotal movement of sald arm.

8. In a sawmill dog, a knee having a vertical face, a log-holding armarranged transversely oi the kneeface and supported at its rear end forpivotal movement in a Vertical plane and about a relatively fixed axis,a shoe, means extending laterally from said shoe and engaging said kneeto gulde sald shoe for movement parallel to the knee face,

a hanger slidably receiving and supporting the log-engaglngend of sa darm and carried by sald shoe for vertlcal movement therewith andpivotally connected thereto to 7 permit tilting of said hanger uponvertical movement of said arm about said axis simultaneously with slmlar movement of semi shoe parallel 'to the knee face, an auxil ary toothcarried by said shoe and projecting beyond the knee face short ofthe rane of operationof said log-engaging end and disposed lIlSLlCh Wise as toenga e a facedlog upon slldlng movement of said arm with respect to saidhanger to position itslog-en a ROSSEILANGILL. a WI IAM RU R

